SECTION 35 - HYDRAULIC SYSTEM 63
4. HYDRAULIC SWING SYSTEM
4.1 DESCRIPTION AND OPERATION
The hydraulic swing system has two versions:
Z it can shift laterally with the backhoe attachment
because installed directly on the sideshift carriage
performing the shifting. This is possible only on the
loader backhoes with sideshift version.
Z it is fixed because it is installed directly on the chas-
sis. This is possible only on loader backhoes with
center pivot version.
The backhoe boom and digging elements can be
moved in an arc about the main chassis of 180 de-
grees.
This movement is obtained by the use of two hydrau-
lic cylinders (1) coupled between the main chassis
and swing post.
The cylinders act directly on the swing post, without
the use of any connecting links or bell cranks.
Each cylinder is free to rotate, around two pivots (3),
while the stem comes out or retracts inside of the
cylinder body (2).
As each cylinder extends or retracts and the swing
post rotates, the cylinders turn in a horizontal plate,
pivoting on the headstocks within the carriage.
Each cylinder is double acting and as hydraulic oil is
fed to a cylinder to turn the swing post, one cylinder
pushes and the other cylinder pulls to perform the
swing cycle.
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